Phoenix Star 4 Inches Downstems with Bowl Replacement Parts PHX584 measures 4 inches in length with a 14.4mm joint size. This downstem and bowl set is made of American Northstar glass rods to offer you a pretty set with a beautiful pattern. The downstem comes with slits to divide smoke into bubbles for better filtration. The joint size of the bowl is 14.4mm. If your 14mm downstem and bowl set is broken, you can take this downstem and bowl set to replace it. You don't have to shop for a new glass bong, it helps you save money.